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dt-bindings: mtd: ingenic: Use standard ecc-engine property
[linux/fpc-iii.git] / drivers / iio / accel / mma8452.c
blob302781126bc604c635b904b31b069fb6a9f97e3d
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * mma8452.c - Support for following Freescale / NXP 3-axis accelerometers:
4 *
5 * device name digital output 7-bit I2C slave address (pin selectable)
6 * ---------------------------------------------------------------------
7 * MMA8451Q 14 bit 0x1c / 0x1d
8 * MMA8452Q 12 bit 0x1c / 0x1d
9 * MMA8453Q 10 bit 0x1c / 0x1d
10 * MMA8652FC 12 bit 0x1d
11 * MMA8653FC 10 bit 0x1d
12 * FXLS8471Q 14 bit 0x1e / 0x1d / 0x1c / 0x1f
13 *
14 * Copyright 2015 Martin Kepplinger <martink@posteo.de>
15 * Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
16 *
17 *
18 * TODO: orientation events
19 */
20
21 #include <linux/module.h>
22 #include <linux/i2c.h>
23 #include <linux/iio/iio.h>
24 #include <linux/iio/sysfs.h>
25 #include <linux/iio/buffer.h>
26 #include <linux/iio/trigger.h>
27 #include <linux/iio/trigger_consumer.h>
28 #include <linux/iio/triggered_buffer.h>
29 #include <linux/iio/events.h>
30 #include <linux/delay.h>
31 #include <linux/of_device.h>
32 #include <linux/of_irq.h>
33 #include <linux/pm_runtime.h>
34 #include <linux/regulator/consumer.h>
35
36 #define MMA8452_STATUS 0x00
37 #define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0))
38 #define MMA8452_OUT_X 0x01 /* MSB first */
39 #define MMA8452_OUT_Y 0x03
40 #define MMA8452_OUT_Z 0x05
41 #define MMA8452_INT_SRC 0x0c
42 #define MMA8452_WHO_AM_I 0x0d
43 #define MMA8452_DATA_CFG 0x0e
44 #define MMA8452_DATA_CFG_FS_MASK GENMASK(1, 0)
45 #define MMA8452_DATA_CFG_FS_2G 0
46 #define MMA8452_DATA_CFG_FS_4G 1
47 #define MMA8452_DATA_CFG_FS_8G 2
48 #define MMA8452_DATA_CFG_HPF_MASK BIT(4)
49 #define MMA8452_HP_FILTER_CUTOFF 0x0f
50 #define MMA8452_HP_FILTER_CUTOFF_SEL_MASK GENMASK(1, 0)
51 #define MMA8452_FF_MT_CFG 0x15
52 #define MMA8452_FF_MT_CFG_OAE BIT(6)
53 #define MMA8452_FF_MT_CFG_ELE BIT(7)
54 #define MMA8452_FF_MT_SRC 0x16
55 #define MMA8452_FF_MT_SRC_XHE BIT(1)
56 #define MMA8452_FF_MT_SRC_YHE BIT(3)
57 #define MMA8452_FF_MT_SRC_ZHE BIT(5)
58 #define MMA8452_FF_MT_THS 0x17
59 #define MMA8452_FF_MT_THS_MASK 0x7f
60 #define MMA8452_FF_MT_COUNT 0x18
61 #define MMA8452_FF_MT_CHAN_SHIFT 3
62 #define MMA8452_TRANSIENT_CFG 0x1d
63 #define MMA8452_TRANSIENT_CFG_CHAN(chan) BIT(chan + 1)
64 #define MMA8452_TRANSIENT_CFG_HPF_BYP BIT(0)
65 #define MMA8452_TRANSIENT_CFG_ELE BIT(4)
66 #define MMA8452_TRANSIENT_SRC 0x1e
67 #define MMA8452_TRANSIENT_SRC_XTRANSE BIT(1)
68 #define MMA8452_TRANSIENT_SRC_YTRANSE BIT(3)
69 #define MMA8452_TRANSIENT_SRC_ZTRANSE BIT(5)
70 #define MMA8452_TRANSIENT_THS 0x1f
71 #define MMA8452_TRANSIENT_THS_MASK GENMASK(6, 0)
72 #define MMA8452_TRANSIENT_COUNT 0x20
73 #define MMA8452_TRANSIENT_CHAN_SHIFT 1
74 #define MMA8452_CTRL_REG1 0x2a
75 #define MMA8452_CTRL_ACTIVE BIT(0)
76 #define MMA8452_CTRL_DR_MASK GENMASK(5, 3)
77 #define MMA8452_CTRL_DR_SHIFT 3
78 #define MMA8452_CTRL_DR_DEFAULT 0x4 /* 50 Hz sample frequency */
79 #define MMA8452_CTRL_REG2 0x2b
80 #define MMA8452_CTRL_REG2_RST BIT(6)
81 #define MMA8452_CTRL_REG2_MODS_SHIFT 3
82 #define MMA8452_CTRL_REG2_MODS_MASK 0x1b
83 #define MMA8452_CTRL_REG4 0x2d
84 #define MMA8452_CTRL_REG5 0x2e
85 #define MMA8452_OFF_X 0x2f
86 #define MMA8452_OFF_Y 0x30
87 #define MMA8452_OFF_Z 0x31
88
89 #define MMA8452_MAX_REG 0x31
90
91 #define MMA8452_INT_DRDY BIT(0)
92 #define MMA8452_INT_FF_MT BIT(2)
93 #define MMA8452_INT_TRANS BIT(5)
94
95 #define MMA8451_DEVICE_ID 0x1a
96 #define MMA8452_DEVICE_ID 0x2a
97 #define MMA8453_DEVICE_ID 0x3a
98 #define MMA8652_DEVICE_ID 0x4a
99 #define MMA8653_DEVICE_ID 0x5a
100 #define FXLS8471_DEVICE_ID 0x6a
101
102 #define MMA8452_AUTO_SUSPEND_DELAY_MS 2000
103
104 struct mma8452_data {
105 struct i2c_client *client;
106 struct mutex lock;
107 u8 ctrl_reg1;
108 u8 data_cfg;
109 const struct mma_chip_info *chip_info;
110 int sleep_val;
111 struct regulator *vdd_reg;
112 struct regulator *vddio_reg;
113 };
114
115 /**
116 * struct mma8452_event_regs - chip specific data related to events
117 * @ev_cfg: event config register address
118 * @ev_cfg_ele: latch bit in event config register
119 * @ev_cfg_chan_shift: number of the bit to enable events in X
120 * direction; in event config register
121 * @ev_src: event source register address
122 * @ev_ths: event threshold register address
123 * @ev_ths_mask: mask for the threshold value
124 * @ev_count: event count (period) register address
125 *
126 * Since not all chips supported by the driver support comparing high pass
127 * filtered data for events (interrupts), different interrupt sources are
128 * used for different chips and the relevant registers are included here.
129 */
130 struct mma8452_event_regs {
131 u8 ev_cfg;
132 u8 ev_cfg_ele;
133 u8 ev_cfg_chan_shift;
134 u8 ev_src;
135 u8 ev_ths;
136 u8 ev_ths_mask;
137 u8 ev_count;
138 };
139
140 static const struct mma8452_event_regs ff_mt_ev_regs = {
141 .ev_cfg = MMA8452_FF_MT_CFG,
142 .ev_cfg_ele = MMA8452_FF_MT_CFG_ELE,
143 .ev_cfg_chan_shift = MMA8452_FF_MT_CHAN_SHIFT,
144 .ev_src = MMA8452_FF_MT_SRC,
145 .ev_ths = MMA8452_FF_MT_THS,
146 .ev_ths_mask = MMA8452_FF_MT_THS_MASK,
147 .ev_count = MMA8452_FF_MT_COUNT
148 };
149
150 static const struct mma8452_event_regs trans_ev_regs = {
151 .ev_cfg = MMA8452_TRANSIENT_CFG,
152 .ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE,
153 .ev_cfg_chan_shift = MMA8452_TRANSIENT_CHAN_SHIFT,
154 .ev_src = MMA8452_TRANSIENT_SRC,
155 .ev_ths = MMA8452_TRANSIENT_THS,
156 .ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,
157 .ev_count = MMA8452_TRANSIENT_COUNT,
158 };
159
160 /**
161 * struct mma_chip_info - chip specific data
162 * @chip_id: WHO_AM_I register's value
163 * @channels: struct iio_chan_spec matching the device's
164 * capabilities
165 * @num_channels: number of channels
166 * @mma_scales: scale factors for converting register values
167 * to m/s^2; 3 modes: 2g, 4g, 8g; 2 integers
168 * per mode: m/s^2 and micro m/s^2
169 * @all_events: all events supported by this chip
170 * @enabled_events: event flags enabled and handled by this driver
171 */
172 struct mma_chip_info {
173 u8 chip_id;
174 const struct iio_chan_spec *channels;
175 int num_channels;
176 const int mma_scales[3][2];
177 int all_events;
178 int enabled_events;
179 };
180
181 enum {
182 idx_x,
183 idx_y,
184 idx_z,
185 idx_ts,
186 };
187
188 static int mma8452_drdy(struct mma8452_data *data)
189 {
190 int tries = 150;
191
192 while (tries-- > 0) {
193 int ret = i2c_smbus_read_byte_data(data->client,
194 MMA8452_STATUS);
195 if (ret < 0)
196 return ret;
197 if ((ret & MMA8452_STATUS_DRDY) == MMA8452_STATUS_DRDY)
198 return 0;
199
200 if (data->sleep_val <= 20)
201 usleep_range(data->sleep_val * 250,
202 data->sleep_val * 500);
203 else
204 msleep(20);
205 }
206
207 dev_err(&data->client->dev, "data not ready\n");
208
209 return -EIO;
210 }
211
212 static int mma8452_set_runtime_pm_state(struct i2c_client *client, bool on)
213 {
214 #ifdef CONFIG_PM
215 int ret;
216
217 if (on) {
218 ret = pm_runtime_get_sync(&client->dev);
219 } else {
220 pm_runtime_mark_last_busy(&client->dev);
221 ret = pm_runtime_put_autosuspend(&client->dev);
222 }
223
224 if (ret < 0) {
225 dev_err(&client->dev,
226 "failed to change power state to %d\n", on);
227 if (on)
228 pm_runtime_put_noidle(&client->dev);
229
230 return ret;
231 }
232 #endif
233
234 return 0;
235 }
236
237 static int mma8452_read(struct mma8452_data *data, __be16 buf[3])
238 {
239 int ret = mma8452_drdy(data);
240
241 if (ret < 0)
242 return ret;
243
244 ret = mma8452_set_runtime_pm_state(data->client, true);
245 if (ret)
246 return ret;
247
248 ret = i2c_smbus_read_i2c_block_data(data->client, MMA8452_OUT_X,
249 3 * sizeof(__be16), (u8 *)buf);
250
251 ret = mma8452_set_runtime_pm_state(data->client, false);
252
253 return ret;
254 }
255
256 static ssize_t mma8452_show_int_plus_micros(char *buf, const int (*vals)[2],
257 int n)
258 {
259 size_t len = 0;
260
261 while (n-- > 0)
262 len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
263 vals[n][0], vals[n][1]);
264
265 /* replace trailing space by newline */
266 buf[len - 1] = '\n';
267
268 return len;
269 }
270
271 static int mma8452_get_int_plus_micros_index(const int (*vals)[2], int n,
272 int val, int val2)
273 {
274 while (n-- > 0)
275 if (val == vals[n][0] && val2 == vals[n][1])
276 return n;
277
278 return -EINVAL;
279 }
280
281 static unsigned int mma8452_get_odr_index(struct mma8452_data *data)
282 {
283 return (data->ctrl_reg1 & MMA8452_CTRL_DR_MASK) >>
284 MMA8452_CTRL_DR_SHIFT;
285 }
286
287 static const int mma8452_samp_freq[8][2] = {
288 {800, 0}, {400, 0}, {200, 0}, {100, 0}, {50, 0}, {12, 500000},
289 {6, 250000}, {1, 560000}
290 };
291
292 /* Datasheet table: step time "Relationship with the ODR" (sample frequency) */
293 static const unsigned int mma8452_time_step_us[4][8] = {
294 { 1250, 2500, 5000, 10000, 20000, 20000, 20000, 20000 }, /* normal */
295 { 1250, 2500, 5000, 10000, 20000, 80000, 80000, 80000 }, /* l p l n */
296 { 1250, 2500, 2500, 2500, 2500, 2500, 2500, 2500 }, /* high res*/
297 { 1250, 2500, 5000, 10000, 20000, 80000, 160000, 160000 } /* l p */
298 };
299
300 /* Datasheet table "High-Pass Filter Cutoff Options" */
301 static const int mma8452_hp_filter_cutoff[4][8][4][2] = {
302 { /* normal */
303 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 800 Hz sample */
304 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 400 Hz sample */
305 { {8, 0}, {4, 0}, {2, 0}, {1, 0} }, /* 200 Hz sample */
306 { {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, /* 100 Hz sample */
307 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 50 Hz sample */
308 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 12.5 Hz sample */
309 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 6.25 Hz sample */
310 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} } /* 1.56 Hz sample */
311 },
312 { /* low noise low power */
313 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
314 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
315 { {8, 0}, {4, 0}, {2, 0}, {1, 0} },
316 { {4, 0}, {2, 0}, {1, 0}, {0, 500000} },
317 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} },
318 { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} },
319 { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} },
320 { {0, 500000}, {0, 250000}, {0, 125000}, {0, 063000} }
321 },
322 { /* high resolution */
323 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
324 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
325 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
326 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
327 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
328 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
329 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
330 { {16, 0}, {8, 0}, {4, 0}, {2, 0} }
331 },
332 { /* low power */
333 { {16, 0}, {8, 0}, {4, 0}, {2, 0} },
334 { {8, 0}, {4, 0}, {2, 0}, {1, 0} },
335 { {4, 0}, {2, 0}, {1, 0}, {0, 500000} },
336 { {2, 0}, {1, 0}, {0, 500000}, {0, 250000} },
337 { {1, 0}, {0, 500000}, {0, 250000}, {0, 125000} },
338 { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} },
339 { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} },
340 { {0, 250000}, {0, 125000}, {0, 063000}, {0, 031000} }
341 }
342 };
343
344 /* Datasheet table "MODS Oversampling modes averaging values at each ODR" */
345 static const u16 mma8452_os_ratio[4][8] = {
346 /* 800 Hz, 400 Hz, ... , 1.56 Hz */
347 { 2, 4, 4, 4, 4, 16, 32, 128 }, /* normal */
348 { 2, 4, 4, 4, 4, 4, 8, 32 }, /* low power low noise */
349 { 2, 4, 8, 16, 32, 128, 256, 1024 }, /* high resolution */
350 { 2, 2, 2, 2, 2, 2, 4, 16 } /* low power */
351 };
352
353 static int mma8452_get_power_mode(struct mma8452_data *data)
354 {
355 int reg;
356
357 reg = i2c_smbus_read_byte_data(data->client,
358 MMA8452_CTRL_REG2);
359 if (reg < 0)
360 return reg;
361
362 return ((reg & MMA8452_CTRL_REG2_MODS_MASK) >>
363 MMA8452_CTRL_REG2_MODS_SHIFT);
364 }
365
366 static ssize_t mma8452_show_samp_freq_avail(struct device *dev,
367 struct device_attribute *attr,
368 char *buf)
369 {
370 return mma8452_show_int_plus_micros(buf, mma8452_samp_freq,
371 ARRAY_SIZE(mma8452_samp_freq));
372 }
373
374 static ssize_t mma8452_show_scale_avail(struct device *dev,
375 struct device_attribute *attr,
376 char *buf)
377 {
378 struct mma8452_data *data = iio_priv(i2c_get_clientdata(
379 to_i2c_client(dev)));
380
381 return mma8452_show_int_plus_micros(buf, data->chip_info->mma_scales,
382 ARRAY_SIZE(data->chip_info->mma_scales));
383 }
384
385 static ssize_t mma8452_show_hp_cutoff_avail(struct device *dev,
386 struct device_attribute *attr,
387 char *buf)
388 {
389 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
390 struct mma8452_data *data = iio_priv(indio_dev);
391 int i, j;
392
393 i = mma8452_get_odr_index(data);
394 j = mma8452_get_power_mode(data);
395 if (j < 0)
396 return j;
397
398 return mma8452_show_int_plus_micros(buf, mma8452_hp_filter_cutoff[j][i],
399 ARRAY_SIZE(mma8452_hp_filter_cutoff[0][0]));
400 }
401
402 static ssize_t mma8452_show_os_ratio_avail(struct device *dev,
403 struct device_attribute *attr,
404 char *buf)
405 {
406 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
407 struct mma8452_data *data = iio_priv(indio_dev);
408 int i = mma8452_get_odr_index(data);
409 int j;
410 u16 val = 0;
411 size_t len = 0;
412
413 for (j = 0; j < ARRAY_SIZE(mma8452_os_ratio); j++) {
414 if (val == mma8452_os_ratio[j][i])
415 continue;
416
417 val = mma8452_os_ratio[j][i];
418
419 len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", val);
420 }
421 buf[len - 1] = '\n';
422
423 return len;
424 }
425
426 static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(mma8452_show_samp_freq_avail);
427 static IIO_DEVICE_ATTR(in_accel_scale_available, 0444,
428 mma8452_show_scale_avail, NULL, 0);
429 static IIO_DEVICE_ATTR(in_accel_filter_high_pass_3db_frequency_available,
430 0444, mma8452_show_hp_cutoff_avail, NULL, 0);
431 static IIO_DEVICE_ATTR(in_accel_oversampling_ratio_available, 0444,
432 mma8452_show_os_ratio_avail, NULL, 0);
433
434 static int mma8452_get_samp_freq_index(struct mma8452_data *data,
435 int val, int val2)
436 {
437 return mma8452_get_int_plus_micros_index(mma8452_samp_freq,
438 ARRAY_SIZE(mma8452_samp_freq),
439 val, val2);
440 }
441
442 static int mma8452_get_scale_index(struct mma8452_data *data, int val, int val2)
443 {
444 return mma8452_get_int_plus_micros_index(data->chip_info->mma_scales,
445 ARRAY_SIZE(data->chip_info->mma_scales), val, val2);
446 }
447
448 static int mma8452_get_hp_filter_index(struct mma8452_data *data,
449 int val, int val2)
450 {
451 int i, j;
452
453 i = mma8452_get_odr_index(data);
454 j = mma8452_get_power_mode(data);
455 if (j < 0)
456 return j;
457
458 return mma8452_get_int_plus_micros_index(mma8452_hp_filter_cutoff[j][i],
459 ARRAY_SIZE(mma8452_hp_filter_cutoff[0][0]), val, val2);
460 }
461
462 static int mma8452_read_hp_filter(struct mma8452_data *data, int *hz, int *uHz)
463 {
464 int j, i, ret;
465
466 ret = i2c_smbus_read_byte_data(data->client, MMA8452_HP_FILTER_CUTOFF);
467 if (ret < 0)
468 return ret;
469
470 i = mma8452_get_odr_index(data);
471 j = mma8452_get_power_mode(data);
472 if (j < 0)
473 return j;
474
475 ret &= MMA8452_HP_FILTER_CUTOFF_SEL_MASK;
476 *hz = mma8452_hp_filter_cutoff[j][i][ret][0];
477 *uHz = mma8452_hp_filter_cutoff[j][i][ret][1];
478
479 return 0;
480 }
481
482 static int mma8452_read_raw(struct iio_dev *indio_dev,
483 struct iio_chan_spec const *chan,
484 int *val, int *val2, long mask)
485 {
486 struct mma8452_data *data = iio_priv(indio_dev);
487 __be16 buffer[3];
488 int i, ret;
489
490 switch (mask) {
491 case IIO_CHAN_INFO_RAW:
492 ret = iio_device_claim_direct_mode(indio_dev);
493 if (ret)
494 return ret;
495
496 mutex_lock(&data->lock);
497 ret = mma8452_read(data, buffer);
498 mutex_unlock(&data->lock);
499 iio_device_release_direct_mode(indio_dev);
500 if (ret < 0)
501 return ret;
502
503 *val = sign_extend32(be16_to_cpu(
504 buffer[chan->scan_index]) >> chan->scan_type.shift,
505 chan->scan_type.realbits - 1);
506
507 return IIO_VAL_INT;
508 case IIO_CHAN_INFO_SCALE:
509 i = data->data_cfg & MMA8452_DATA_CFG_FS_MASK;
510 *val = data->chip_info->mma_scales[i][0];
511 *val2 = data->chip_info->mma_scales[i][1];
512
513 return IIO_VAL_INT_PLUS_MICRO;
514 case IIO_CHAN_INFO_SAMP_FREQ:
515 i = mma8452_get_odr_index(data);
516 *val = mma8452_samp_freq[i][0];
517 *val2 = mma8452_samp_freq[i][1];
518
519 return IIO_VAL_INT_PLUS_MICRO;
520 case IIO_CHAN_INFO_CALIBBIAS:
521 ret = i2c_smbus_read_byte_data(data->client,
522 MMA8452_OFF_X +
523 chan->scan_index);
524 if (ret < 0)
525 return ret;
526
527 *val = sign_extend32(ret, 7);
528
529 return IIO_VAL_INT;
530 case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
531 if (data->data_cfg & MMA8452_DATA_CFG_HPF_MASK) {
532 ret = mma8452_read_hp_filter(data, val, val2);
533 if (ret < 0)
534 return ret;
535 } else {
536 *val = 0;
537 *val2 = 0;
538 }
539
540 return IIO_VAL_INT_PLUS_MICRO;
541 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
542 ret = mma8452_get_power_mode(data);
543 if (ret < 0)
544 return ret;
545
546 i = mma8452_get_odr_index(data);
547
548 *val = mma8452_os_ratio[ret][i];
549 return IIO_VAL_INT;
550 }
551
552 return -EINVAL;
553 }
554
555 static int mma8452_calculate_sleep(struct mma8452_data *data)
556 {
557 int ret, i = mma8452_get_odr_index(data);
558
559 if (mma8452_samp_freq[i][0] > 0)
560 ret = 1000 / mma8452_samp_freq[i][0];
561 else
562 ret = 1000;
563
564 return ret == 0 ? 1 : ret;
565 }
566
567 static int mma8452_standby(struct mma8452_data *data)
568 {
569 return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1,
570 data->ctrl_reg1 & ~MMA8452_CTRL_ACTIVE);
571 }
572
573 static int mma8452_active(struct mma8452_data *data)
574 {
575 return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1,
576 data->ctrl_reg1);
577 }
578
579 /* returns >0 if active, 0 if in standby and <0 on error */
580 static int mma8452_is_active(struct mma8452_data *data)
581 {
582 int reg;
583
584 reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG1);
585 if (reg < 0)
586 return reg;
587
588 return reg & MMA8452_CTRL_ACTIVE;
589 }
590
591 static int mma8452_change_config(struct mma8452_data *data, u8 reg, u8 val)
592 {
593 int ret;
594 int is_active;
595
596 mutex_lock(&data->lock);
597
598 is_active = mma8452_is_active(data);
599 if (is_active < 0) {
600 ret = is_active;
601 goto fail;
602 }
603
604 /* config can only be changed when in standby */
605 if (is_active > 0) {
606 ret = mma8452_standby(data);
607 if (ret < 0)
608 goto fail;
609 }
610
611 ret = i2c_smbus_write_byte_data(data->client, reg, val);
612 if (ret < 0)
613 goto fail;
614
615 if (is_active > 0) {
616 ret = mma8452_active(data);
617 if (ret < 0)
618 goto fail;
619 }
620
621 ret = 0;
622 fail:
623 mutex_unlock(&data->lock);
624
625 return ret;
626 }
627
628 static int mma8452_set_power_mode(struct mma8452_data *data, u8 mode)
629 {
630 int reg;
631
632 reg = i2c_smbus_read_byte_data(data->client,
633 MMA8452_CTRL_REG2);
634 if (reg < 0)
635 return reg;
636
637 reg &= ~MMA8452_CTRL_REG2_MODS_MASK;
638 reg |= mode << MMA8452_CTRL_REG2_MODS_SHIFT;
639
640 return mma8452_change_config(data, MMA8452_CTRL_REG2, reg);
641 }
642
643 /* returns >0 if in freefall mode, 0 if not or <0 if an error occurred */
644 static int mma8452_freefall_mode_enabled(struct mma8452_data *data)
645 {
646 int val;
647
648 val = i2c_smbus_read_byte_data(data->client, MMA8452_FF_MT_CFG);
649 if (val < 0)
650 return val;
651
652 return !(val & MMA8452_FF_MT_CFG_OAE);
653 }
654
655 static int mma8452_set_freefall_mode(struct mma8452_data *data, bool state)
656 {
657 int val;
658
659 if ((state && mma8452_freefall_mode_enabled(data)) ||
660 (!state && !(mma8452_freefall_mode_enabled(data))))
661 return 0;
662
663 val = i2c_smbus_read_byte_data(data->client, MMA8452_FF_MT_CFG);
664 if (val < 0)
665 return val;
666
667 if (state) {
668 val |= BIT(idx_x + MMA8452_FF_MT_CHAN_SHIFT);
669 val |= BIT(idx_y + MMA8452_FF_MT_CHAN_SHIFT);
670 val |= BIT(idx_z + MMA8452_FF_MT_CHAN_SHIFT);
671 val &= ~MMA8452_FF_MT_CFG_OAE;
672 } else {
673 val &= ~BIT(idx_x + MMA8452_FF_MT_CHAN_SHIFT);
674 val &= ~BIT(idx_y + MMA8452_FF_MT_CHAN_SHIFT);
675 val &= ~BIT(idx_z + MMA8452_FF_MT_CHAN_SHIFT);
676 val |= MMA8452_FF_MT_CFG_OAE;
677 }
678
679 return mma8452_change_config(data, MMA8452_FF_MT_CFG, val);
680 }
681
682 static int mma8452_set_hp_filter_frequency(struct mma8452_data *data,
683 int val, int val2)
684 {
685 int i, reg;
686
687 i = mma8452_get_hp_filter_index(data, val, val2);
688 if (i < 0)
689 return i;
690
691 reg = i2c_smbus_read_byte_data(data->client,
692 MMA8452_HP_FILTER_CUTOFF);
693 if (reg < 0)
694 return reg;
695
696 reg &= ~MMA8452_HP_FILTER_CUTOFF_SEL_MASK;
697 reg |= i;
698
699 return mma8452_change_config(data, MMA8452_HP_FILTER_CUTOFF, reg);
700 }
701
702 static int mma8452_write_raw(struct iio_dev *indio_dev,
703 struct iio_chan_spec const *chan,
704 int val, int val2, long mask)
705 {
706 struct mma8452_data *data = iio_priv(indio_dev);
707 int i, ret;
708
709 ret = iio_device_claim_direct_mode(indio_dev);
710 if (ret)
711 return ret;
712
713 switch (mask) {
714 case IIO_CHAN_INFO_SAMP_FREQ:
715 i = mma8452_get_samp_freq_index(data, val, val2);
716 if (i < 0) {
717 ret = i;
718 break;
719 }
720 data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK;
721 data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT;
722
723 data->sleep_val = mma8452_calculate_sleep(data);
724
725 ret = mma8452_change_config(data, MMA8452_CTRL_REG1,
726 data->ctrl_reg1);
727 break;
728 case IIO_CHAN_INFO_SCALE:
729 i = mma8452_get_scale_index(data, val, val2);
730 if (i < 0) {
731 ret = i;
732 break;
733 }
734
735 data->data_cfg &= ~MMA8452_DATA_CFG_FS_MASK;
736 data->data_cfg |= i;
737
738 ret = mma8452_change_config(data, MMA8452_DATA_CFG,
739 data->data_cfg);
740 break;
741 case IIO_CHAN_INFO_CALIBBIAS:
742 if (val < -128 || val > 127) {
743 ret = -EINVAL;
744 break;
745 }
746
747 ret = mma8452_change_config(data,
748 MMA8452_OFF_X + chan->scan_index,
749 val);
750 break;
751
752 case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
753 if (val == 0 && val2 == 0) {
754 data->data_cfg &= ~MMA8452_DATA_CFG_HPF_MASK;
755 } else {
756 data->data_cfg |= MMA8452_DATA_CFG_HPF_MASK;
757 ret = mma8452_set_hp_filter_frequency(data, val, val2);
758 if (ret < 0)
759 break;
760 }
761
762 ret = mma8452_change_config(data, MMA8452_DATA_CFG,
763 data->data_cfg);
764 break;
765
766 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
767 ret = mma8452_get_odr_index(data);
768
769 for (i = 0; i < ARRAY_SIZE(mma8452_os_ratio); i++) {
770 if (mma8452_os_ratio[i][ret] == val) {
771 ret = mma8452_set_power_mode(data, i);
772 break;
773 }
774 }
775 break;
776 default:
777 ret = -EINVAL;
778 break;
779 }
780
781 iio_device_release_direct_mode(indio_dev);
782 return ret;
783 }
784
785 static int mma8452_get_event_regs(struct mma8452_data *data,
786 const struct iio_chan_spec *chan, enum iio_event_direction dir,
787 const struct mma8452_event_regs **ev_reg)
788 {
789 if (!chan)
790 return -EINVAL;
791
792 switch (chan->type) {
793 case IIO_ACCEL:
794 switch (dir) {
795 case IIO_EV_DIR_RISING:
796 if ((data->chip_info->all_events
797 & MMA8452_INT_TRANS) &&
798 (data->chip_info->enabled_events
799 & MMA8452_INT_TRANS))
800 *ev_reg = &trans_ev_regs;
801 else
802 *ev_reg = &ff_mt_ev_regs;
803 return 0;
804 case IIO_EV_DIR_FALLING:
805 *ev_reg = &ff_mt_ev_regs;
806 return 0;
807 default:
808 return -EINVAL;
809 }
810 default:
811 return -EINVAL;
812 }
813 }
814
815 static int mma8452_read_event_value(struct iio_dev *indio_dev,
816 const struct iio_chan_spec *chan,
817 enum iio_event_type type,
818 enum iio_event_direction dir,
819 enum iio_event_info info,
820 int *val, int *val2)
821 {
822 struct mma8452_data *data = iio_priv(indio_dev);
823 int ret, us, power_mode;
824 const struct mma8452_event_regs *ev_regs;
825
826 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs);
827 if (ret)
828 return ret;
829
830 switch (info) {
831 case IIO_EV_INFO_VALUE:
832 ret = i2c_smbus_read_byte_data(data->client, ev_regs->ev_ths);
833 if (ret < 0)
834 return ret;
835
836 *val = ret & ev_regs->ev_ths_mask;
837
838 return IIO_VAL_INT;
839
840 case IIO_EV_INFO_PERIOD:
841 ret = i2c_smbus_read_byte_data(data->client, ev_regs->ev_count);
842 if (ret < 0)
843 return ret;
844
845 power_mode = mma8452_get_power_mode(data);
846 if (power_mode < 0)
847 return power_mode;
848
849 us = ret * mma8452_time_step_us[power_mode][
850 mma8452_get_odr_index(data)];
851 *val = us / USEC_PER_SEC;
852 *val2 = us % USEC_PER_SEC;
853
854 return IIO_VAL_INT_PLUS_MICRO;
855
856 case IIO_EV_INFO_HIGH_PASS_FILTER_3DB:
857 ret = i2c_smbus_read_byte_data(data->client,
858 MMA8452_TRANSIENT_CFG);
859 if (ret < 0)
860 return ret;
861
862 if (ret & MMA8452_TRANSIENT_CFG_HPF_BYP) {
863 *val = 0;
864 *val2 = 0;
865 } else {
866 ret = mma8452_read_hp_filter(data, val, val2);
867 if (ret < 0)
868 return ret;
869 }
870
871 return IIO_VAL_INT_PLUS_MICRO;
872
873 default:
874 return -EINVAL;
875 }
876 }
877
878 static int mma8452_write_event_value(struct iio_dev *indio_dev,
879 const struct iio_chan_spec *chan,
880 enum iio_event_type type,
881 enum iio_event_direction dir,
882 enum iio_event_info info,
883 int val, int val2)
884 {
885 struct mma8452_data *data = iio_priv(indio_dev);
886 int ret, reg, steps;
887 const struct mma8452_event_regs *ev_regs;
888
889 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs);
890 if (ret)
891 return ret;
892
893 switch (info) {
894 case IIO_EV_INFO_VALUE:
895 if (val < 0 || val > ev_regs->ev_ths_mask)
896 return -EINVAL;
897
898 return mma8452_change_config(data, ev_regs->ev_ths, val);
899
900 case IIO_EV_INFO_PERIOD:
901 ret = mma8452_get_power_mode(data);
902 if (ret < 0)
903 return ret;
904
905 steps = (val * USEC_PER_SEC + val2) /
906 mma8452_time_step_us[ret][
907 mma8452_get_odr_index(data)];
908
909 if (steps < 0 || steps > 0xff)
910 return -EINVAL;
911
912 return mma8452_change_config(data, ev_regs->ev_count, steps);
913
914 case IIO_EV_INFO_HIGH_PASS_FILTER_3DB:
915 reg = i2c_smbus_read_byte_data(data->client,
916 MMA8452_TRANSIENT_CFG);
917 if (reg < 0)
918 return reg;
919
920 if (val == 0 && val2 == 0) {
921 reg |= MMA8452_TRANSIENT_CFG_HPF_BYP;
922 } else {
923 reg &= ~MMA8452_TRANSIENT_CFG_HPF_BYP;
924 ret = mma8452_set_hp_filter_frequency(data, val, val2);
925 if (ret < 0)
926 return ret;
927 }
928
929 return mma8452_change_config(data, MMA8452_TRANSIENT_CFG, reg);
930
931 default:
932 return -EINVAL;
933 }
934 }
935
936 static int mma8452_read_event_config(struct iio_dev *indio_dev,
937 const struct iio_chan_spec *chan,
938 enum iio_event_type type,
939 enum iio_event_direction dir)
940 {
941 struct mma8452_data *data = iio_priv(indio_dev);
942 int ret;
943 const struct mma8452_event_regs *ev_regs;
944
945 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs);
946 if (ret)
947 return ret;
948
949 switch (dir) {
950 case IIO_EV_DIR_FALLING:
951 return mma8452_freefall_mode_enabled(data);
952 case IIO_EV_DIR_RISING:
953 ret = i2c_smbus_read_byte_data(data->client,
954 ev_regs->ev_cfg);
955 if (ret < 0)
956 return ret;
957
958 return !!(ret & BIT(chan->scan_index +
959 ev_regs->ev_cfg_chan_shift));
960 default:
961 return -EINVAL;
962 }
963 }
964
965 static int mma8452_write_event_config(struct iio_dev *indio_dev,
966 const struct iio_chan_spec *chan,
967 enum iio_event_type type,
968 enum iio_event_direction dir,
969 int state)
970 {
971 struct mma8452_data *data = iio_priv(indio_dev);
972 int val, ret;
973 const struct mma8452_event_regs *ev_regs;
974
975 ret = mma8452_get_event_regs(data, chan, dir, &ev_regs);
976 if (ret)
977 return ret;
978
979 ret = mma8452_set_runtime_pm_state(data->client, state);
980 if (ret)
981 return ret;
982
983 switch (dir) {
984 case IIO_EV_DIR_FALLING:
985 return mma8452_set_freefall_mode(data, state);
986 case IIO_EV_DIR_RISING:
987 val = i2c_smbus_read_byte_data(data->client, ev_regs->ev_cfg);
988 if (val < 0)
989 return val;
990
991 if (state) {
992 if (mma8452_freefall_mode_enabled(data)) {
993 val &= ~BIT(idx_x + ev_regs->ev_cfg_chan_shift);
994 val &= ~BIT(idx_y + ev_regs->ev_cfg_chan_shift);
995 val &= ~BIT(idx_z + ev_regs->ev_cfg_chan_shift);
996 val |= MMA8452_FF_MT_CFG_OAE;
997 }
998 val |= BIT(chan->scan_index +
999 ev_regs->ev_cfg_chan_shift);
1000 } else {
1001 if (mma8452_freefall_mode_enabled(data))
1002 return 0;
1003
1004 val &= ~BIT(chan->scan_index +
1005 ev_regs->ev_cfg_chan_shift);
1006 }
1007
1008 val |= ev_regs->ev_cfg_ele;
1009
1010 return mma8452_change_config(data, ev_regs->ev_cfg, val);
1011 default:
1012 return -EINVAL;
1013 }
1014 }
1015
1016 static void mma8452_transient_interrupt(struct iio_dev *indio_dev)
1017 {
1018 struct mma8452_data *data = iio_priv(indio_dev);
1019 s64 ts = iio_get_time_ns(indio_dev);
1020 int src;
1021
1022 src = i2c_smbus_read_byte_data(data->client, MMA8452_TRANSIENT_SRC);
1023 if (src < 0)
1024 return;
1025
1026 if (src & MMA8452_TRANSIENT_SRC_XTRANSE)
1027 iio_push_event(indio_dev,
1028 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X,
1029 IIO_EV_TYPE_MAG,
1030 IIO_EV_DIR_RISING),
1031 ts);
1032
1033 if (src & MMA8452_TRANSIENT_SRC_YTRANSE)
1034 iio_push_event(indio_dev,
1035 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Y,
1036 IIO_EV_TYPE_MAG,
1037 IIO_EV_DIR_RISING),
1038 ts);
1039
1040 if (src & MMA8452_TRANSIENT_SRC_ZTRANSE)
1041 iio_push_event(indio_dev,
1042 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Z,
1043 IIO_EV_TYPE_MAG,
1044 IIO_EV_DIR_RISING),
1045 ts);
1046 }
1047
1048 static irqreturn_t mma8452_interrupt(int irq, void *p)
1049 {
1050 struct iio_dev *indio_dev = p;
1051 struct mma8452_data *data = iio_priv(indio_dev);
1052 int ret = IRQ_NONE;
1053 int src;
1054
1055 src = i2c_smbus_read_byte_data(data->client, MMA8452_INT_SRC);
1056 if (src < 0)
1057 return IRQ_NONE;
1058
1059 if (!(src & (data->chip_info->enabled_events | MMA8452_INT_DRDY)))
1060 return IRQ_NONE;
1061
1062 if (src & MMA8452_INT_DRDY) {
1063 iio_trigger_poll_chained(indio_dev->trig);
1064 ret = IRQ_HANDLED;
1065 }
1066
1067 if (src & MMA8452_INT_FF_MT) {
1068 if (mma8452_freefall_mode_enabled(data)) {
1069 s64 ts = iio_get_time_ns(indio_dev);
1070
1071 iio_push_event(indio_dev,
1072 IIO_MOD_EVENT_CODE(IIO_ACCEL, 0,
1073 IIO_MOD_X_AND_Y_AND_Z,
1074 IIO_EV_TYPE_MAG,
1075 IIO_EV_DIR_FALLING),
1076 ts);
1077 }
1078 ret = IRQ_HANDLED;
1079 }
1080
1081 if (src & MMA8452_INT_TRANS) {
1082 mma8452_transient_interrupt(indio_dev);
1083 ret = IRQ_HANDLED;
1084 }
1085
1086 return ret;
1087 }
1088
1089 static irqreturn_t mma8452_trigger_handler(int irq, void *p)
1090 {
1091 struct iio_poll_func *pf = p;
1092 struct iio_dev *indio_dev = pf->indio_dev;
1093 struct mma8452_data *data = iio_priv(indio_dev);
1094 u8 buffer[16]; /* 3 16-bit channels + padding + ts */
1095 int ret;
1096
1097 ret = mma8452_read(data, (__be16 *)buffer);
1098 if (ret < 0)
1099 goto done;
1100
1101 iio_push_to_buffers_with_timestamp(indio_dev, buffer,
1102 iio_get_time_ns(indio_dev));
1103
1104 done:
1105 iio_trigger_notify_done(indio_dev->trig);
1106
1107 return IRQ_HANDLED;
1108 }
1109
1110 static int mma8452_reg_access_dbg(struct iio_dev *indio_dev,
1111 unsigned int reg, unsigned int writeval,
1112 unsigned int *readval)
1113 {
1114 int ret;
1115 struct mma8452_data *data = iio_priv(indio_dev);
1116
1117 if (reg > MMA8452_MAX_REG)
1118 return -EINVAL;
1119
1120 if (!readval)
1121 return mma8452_change_config(data, reg, writeval);
1122
1123 ret = i2c_smbus_read_byte_data(data->client, reg);
1124 if (ret < 0)
1125 return ret;
1126
1127 *readval = ret;
1128
1129 return 0;
1130 }
1131
1132 static const struct iio_event_spec mma8452_freefall_event[] = {
1133 {
1134 .type = IIO_EV_TYPE_MAG,
1135 .dir = IIO_EV_DIR_FALLING,
1136 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
1137 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
1138 BIT(IIO_EV_INFO_PERIOD) |
1139 BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB)
1140 },
1141 };
1142
1143 static const struct iio_event_spec mma8652_freefall_event[] = {
1144 {
1145 .type = IIO_EV_TYPE_MAG,
1146 .dir = IIO_EV_DIR_FALLING,
1147 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
1148 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
1149 BIT(IIO_EV_INFO_PERIOD)
1150 },
1151 };
1152
1153 static const struct iio_event_spec mma8452_transient_event[] = {
1154 {
1155 .type = IIO_EV_TYPE_MAG,
1156 .dir = IIO_EV_DIR_RISING,
1157 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
1158 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
1159 BIT(IIO_EV_INFO_PERIOD) |
1160 BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB)
1161 },
1162 };
1163
1164 static const struct iio_event_spec mma8452_motion_event[] = {
1165 {
1166 .type = IIO_EV_TYPE_MAG,
1167 .dir = IIO_EV_DIR_RISING,
1168 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
1169 .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
1170 BIT(IIO_EV_INFO_PERIOD)
1171 },
1172 };
1173
1174 /*
1175 * Threshold is configured in fixed 8G/127 steps regardless of
1176 * currently selected scale for measurement.
1177 */
1178 static IIO_CONST_ATTR_NAMED(accel_transient_scale, in_accel_scale, "0.617742");
1179
1180 static struct attribute *mma8452_event_attributes[] = {
1181 &iio_const_attr_accel_transient_scale.dev_attr.attr,
1182 NULL,
1183 };
1184
1185 static struct attribute_group mma8452_event_attribute_group = {
1186 .attrs = mma8452_event_attributes,
1187 };
1188
1189 #define MMA8452_FREEFALL_CHANNEL(modifier) { \
1190 .type = IIO_ACCEL, \
1191 .modified = 1, \
1192 .channel2 = modifier, \
1193 .scan_index = -1, \
1194 .event_spec = mma8452_freefall_event, \
1195 .num_event_specs = ARRAY_SIZE(mma8452_freefall_event), \
1196 }
1197
1198 #define MMA8652_FREEFALL_CHANNEL(modifier) { \
1199 .type = IIO_ACCEL, \
1200 .modified = 1, \
1201 .channel2 = modifier, \
1202 .scan_index = -1, \
1203 .event_spec = mma8652_freefall_event, \
1204 .num_event_specs = ARRAY_SIZE(mma8652_freefall_event), \
1205 }
1206
1207 #define MMA8452_CHANNEL(axis, idx, bits) { \
1208 .type = IIO_ACCEL, \
1209 .modified = 1, \
1210 .channel2 = IIO_MOD_##axis, \
1211 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
1212 BIT(IIO_CHAN_INFO_CALIBBIAS), \
1213 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
1214 BIT(IIO_CHAN_INFO_SCALE) | \
1215 BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY) | \
1216 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
1217 .scan_index = idx, \
1218 .scan_type = { \
1219 .sign = 's', \
1220 .realbits = (bits), \
1221 .storagebits = 16, \
1222 .shift = 16 - (bits), \
1223 .endianness = IIO_BE, \
1224 }, \
1225 .event_spec = mma8452_transient_event, \
1226 .num_event_specs = ARRAY_SIZE(mma8452_transient_event), \
1227 }
1228
1229 #define MMA8652_CHANNEL(axis, idx, bits) { \
1230 .type = IIO_ACCEL, \
1231 .modified = 1, \
1232 .channel2 = IIO_MOD_##axis, \
1233 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
1234 BIT(IIO_CHAN_INFO_CALIBBIAS), \
1235 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
1236 BIT(IIO_CHAN_INFO_SCALE) | \
1237 BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
1238 .scan_index = idx, \
1239 .scan_type = { \
1240 .sign = 's', \
1241 .realbits = (bits), \
1242 .storagebits = 16, \
1243 .shift = 16 - (bits), \
1244 .endianness = IIO_BE, \
1245 }, \
1246 .event_spec = mma8452_motion_event, \
1247 .num_event_specs = ARRAY_SIZE(mma8452_motion_event), \
1248 }
1249
1250 static const struct iio_chan_spec mma8451_channels[] = {
1251 MMA8452_CHANNEL(X, idx_x, 14),
1252 MMA8452_CHANNEL(Y, idx_y, 14),
1253 MMA8452_CHANNEL(Z, idx_z, 14),
1254 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1255 MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1256 };
1257
1258 static const struct iio_chan_spec mma8452_channels[] = {
1259 MMA8452_CHANNEL(X, idx_x, 12),
1260 MMA8452_CHANNEL(Y, idx_y, 12),
1261 MMA8452_CHANNEL(Z, idx_z, 12),
1262 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1263 MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1264 };
1265
1266 static const struct iio_chan_spec mma8453_channels[] = {
1267 MMA8452_CHANNEL(X, idx_x, 10),
1268 MMA8452_CHANNEL(Y, idx_y, 10),
1269 MMA8452_CHANNEL(Z, idx_z, 10),
1270 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1271 MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1272 };
1273
1274 static const struct iio_chan_spec mma8652_channels[] = {
1275 MMA8652_CHANNEL(X, idx_x, 12),
1276 MMA8652_CHANNEL(Y, idx_y, 12),
1277 MMA8652_CHANNEL(Z, idx_z, 12),
1278 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1279 MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1280 };
1281
1282 static const struct iio_chan_spec mma8653_channels[] = {
1283 MMA8652_CHANNEL(X, idx_x, 10),
1284 MMA8652_CHANNEL(Y, idx_y, 10),
1285 MMA8652_CHANNEL(Z, idx_z, 10),
1286 IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
1287 MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
1288 };
1289
1290 enum {
1291 mma8451,
1292 mma8452,
1293 mma8453,
1294 mma8652,
1295 mma8653,
1296 fxls8471,
1297 };
1298
1299 static const struct mma_chip_info mma_chip_info_table[] = {
1300 [mma8451] = {
1301 .chip_id = MMA8451_DEVICE_ID,
1302 .channels = mma8451_channels,
1303 .num_channels = ARRAY_SIZE(mma8451_channels),
1304 /*
1305 * Hardware has fullscale of -2G, -4G, -8G corresponding to
1306 * raw value -8192 for 14 bit, -2048 for 12 bit or -512 for 10
1307 * bit.
1308 * The userspace interface uses m/s^2 and we declare micro units
1309 * So scale factor for 12 bit here is given by:
1310 * g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665
1311 */
1312 .mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} },
1313 /*
1314 * Although we enable the interrupt sources once and for
1315 * all here the event detection itself is not enabled until
1316 * userspace asks for it by mma8452_write_event_config()
1317 */
1318 .all_events = MMA8452_INT_DRDY |
1319 MMA8452_INT_TRANS |
1320 MMA8452_INT_FF_MT,
1321 .enabled_events = MMA8452_INT_TRANS |
1322 MMA8452_INT_FF_MT,
1323 },
1324 [mma8452] = {
1325 .chip_id = MMA8452_DEVICE_ID,
1326 .channels = mma8452_channels,
1327 .num_channels = ARRAY_SIZE(mma8452_channels),
1328 .mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} },
1329 /*
1330 * Although we enable the interrupt sources once and for
1331 * all here the event detection itself is not enabled until
1332 * userspace asks for it by mma8452_write_event_config()
1333 */
1334 .all_events = MMA8452_INT_DRDY |
1335 MMA8452_INT_TRANS |
1336 MMA8452_INT_FF_MT,
1337 .enabled_events = MMA8452_INT_TRANS |
1338 MMA8452_INT_FF_MT,
1339 },
1340 [mma8453] = {
1341 .chip_id = MMA8453_DEVICE_ID,
1342 .channels = mma8453_channels,
1343 .num_channels = ARRAY_SIZE(mma8453_channels),
1344 .mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} },
1345 /*
1346 * Although we enable the interrupt sources once and for
1347 * all here the event detection itself is not enabled until
1348 * userspace asks for it by mma8452_write_event_config()
1349 */
1350 .all_events = MMA8452_INT_DRDY |
1351 MMA8452_INT_TRANS |
1352 MMA8452_INT_FF_MT,
1353 .enabled_events = MMA8452_INT_TRANS |
1354 MMA8452_INT_FF_MT,
1355 },
1356 [mma8652] = {
1357 .chip_id = MMA8652_DEVICE_ID,
1358 .channels = mma8652_channels,
1359 .num_channels = ARRAY_SIZE(mma8652_channels),
1360 .mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} },
1361 .all_events = MMA8452_INT_DRDY |
1362 MMA8452_INT_FF_MT,
1363 .enabled_events = MMA8452_INT_FF_MT,
1364 },
1365 [mma8653] = {
1366 .chip_id = MMA8653_DEVICE_ID,
1367 .channels = mma8653_channels,
1368 .num_channels = ARRAY_SIZE(mma8653_channels),
1369 .mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} },
1370 /*
1371 * Although we enable the interrupt sources once and for
1372 * all here the event detection itself is not enabled until
1373 * userspace asks for it by mma8452_write_event_config()
1374 */
1375 .all_events = MMA8452_INT_DRDY |
1376 MMA8452_INT_FF_MT,
1377 .enabled_events = MMA8452_INT_FF_MT,
1378 },
1379 [fxls8471] = {
1380 .chip_id = FXLS8471_DEVICE_ID,
1381 .channels = mma8451_channels,
1382 .num_channels = ARRAY_SIZE(mma8451_channels),
1383 .mma_scales = { {0, 2394}, {0, 4788}, {0, 9577} },
1384 /*
1385 * Although we enable the interrupt sources once and for
1386 * all here the event detection itself is not enabled until
1387 * userspace asks for it by mma8452_write_event_config()
1388 */
1389 .all_events = MMA8452_INT_DRDY |
1390 MMA8452_INT_TRANS |
1391 MMA8452_INT_FF_MT,
1392 .enabled_events = MMA8452_INT_TRANS |
1393 MMA8452_INT_FF_MT,
1394 },
1395 };
1396
1397 static struct attribute *mma8452_attributes[] = {
1398 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
1399 &iio_dev_attr_in_accel_scale_available.dev_attr.attr,
1400 &iio_dev_attr_in_accel_filter_high_pass_3db_frequency_available.dev_attr.attr,
1401 &iio_dev_attr_in_accel_oversampling_ratio_available.dev_attr.attr,
1402 NULL
1403 };
1404
1405 static const struct attribute_group mma8452_group = {
1406 .attrs = mma8452_attributes,
1407 };
1408
1409 static const struct iio_info mma8452_info = {
1410 .attrs = &mma8452_group,
1411 .read_raw = &mma8452_read_raw,
1412 .write_raw = &mma8452_write_raw,
1413 .event_attrs = &mma8452_event_attribute_group,
1414 .read_event_value = &mma8452_read_event_value,
1415 .write_event_value = &mma8452_write_event_value,
1416 .read_event_config = &mma8452_read_event_config,
1417 .write_event_config = &mma8452_write_event_config,
1418 .debugfs_reg_access = &mma8452_reg_access_dbg,
1419 };
1420
1421 static const unsigned long mma8452_scan_masks[] = {0x7, 0};
1422
1423 static int mma8452_data_rdy_trigger_set_state(struct iio_trigger *trig,
1424 bool state)
1425 {
1426 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
1427 struct mma8452_data *data = iio_priv(indio_dev);
1428 int reg, ret;
1429
1430 ret = mma8452_set_runtime_pm_state(data->client, state);
1431 if (ret)
1432 return ret;
1433
1434 reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG4);
1435 if (reg < 0)
1436 return reg;
1437
1438 if (state)
1439 reg |= MMA8452_INT_DRDY;
1440 else
1441 reg &= ~MMA8452_INT_DRDY;
1442
1443 return mma8452_change_config(data, MMA8452_CTRL_REG4, reg);
1444 }
1445
1446 static const struct iio_trigger_ops mma8452_trigger_ops = {
1447 .set_trigger_state = mma8452_data_rdy_trigger_set_state,
1448 .validate_device = iio_trigger_validate_own_device,
1449 };
1450
1451 static int mma8452_trigger_setup(struct iio_dev *indio_dev)
1452 {
1453 struct mma8452_data *data = iio_priv(indio_dev);
1454 struct iio_trigger *trig;
1455 int ret;
1456
1457 trig = devm_iio_trigger_alloc(&data->client->dev, "%s-dev%d",
1458 indio_dev->name,
1459 indio_dev->id);
1460 if (!trig)
1461 return -ENOMEM;
1462
1463 trig->dev.parent = &data->client->dev;
1464 trig->ops = &mma8452_trigger_ops;
1465 iio_trigger_set_drvdata(trig, indio_dev);
1466
1467 ret = iio_trigger_register(trig);
1468 if (ret)
1469 return ret;
1470
1471 indio_dev->trig = trig;
1472
1473 return 0;
1474 }
1475
1476 static void mma8452_trigger_cleanup(struct iio_dev *indio_dev)
1477 {
1478 if (indio_dev->trig)
1479 iio_trigger_unregister(indio_dev->trig);
1480 }
1481
1482 static int mma8452_reset(struct i2c_client *client)
1483 {
1484 int i;
1485 int ret;
1486
1487 ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG2,
1488 MMA8452_CTRL_REG2_RST);
1489 if (ret < 0)
1490 return ret;
1491
1492 for (i = 0; i < 10; i++) {
1493 usleep_range(100, 200);
1494 ret = i2c_smbus_read_byte_data(client, MMA8452_CTRL_REG2);
1495 if (ret == -EIO)
1496 continue; /* I2C comm reset */
1497 if (ret < 0)
1498 return ret;
1499 if (!(ret & MMA8452_CTRL_REG2_RST))
1500 return 0;
1501 }
1502
1503 return -ETIMEDOUT;
1504 }
1505
1506 static const struct of_device_id mma8452_dt_ids[] = {
1507 { .compatible = "fsl,mma8451", .data = &mma_chip_info_table[mma8451] },
1508 { .compatible = "fsl,mma8452", .data = &mma_chip_info_table[mma8452] },
1509 { .compatible = "fsl,mma8453", .data = &mma_chip_info_table[mma8453] },
1510 { .compatible = "fsl,mma8652", .data = &mma_chip_info_table[mma8652] },
1511 { .compatible = "fsl,mma8653", .data = &mma_chip_info_table[mma8653] },
1512 { .compatible = "fsl,fxls8471", .data = &mma_chip_info_table[fxls8471] },
1513 { }
1514 };
1515 MODULE_DEVICE_TABLE(of, mma8452_dt_ids);
1516
1517 static int mma8452_probe(struct i2c_client *client,
1518 const struct i2c_device_id *id)
1519 {
1520 struct mma8452_data *data;
1521 struct iio_dev *indio_dev;
1522 int ret;
1523 const struct of_device_id *match;
1524
1525 match = of_match_device(mma8452_dt_ids, &client->dev);
1526 if (!match) {
1527 dev_err(&client->dev, "unknown device model\n");
1528 return -ENODEV;
1529 }
1530
1531 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1532 if (!indio_dev)
1533 return -ENOMEM;
1534
1535 data = iio_priv(indio_dev);
1536 data->client = client;
1537 mutex_init(&data->lock);
1538 data->chip_info = match->data;
1539
1540 data->vdd_reg = devm_regulator_get(&client->dev, "vdd");
1541 if (IS_ERR(data->vdd_reg)) {
1542 if (PTR_ERR(data->vdd_reg) == -EPROBE_DEFER)
1543 return -EPROBE_DEFER;
1544
1545 dev_err(&client->dev, "failed to get VDD regulator!\n");
1546 return PTR_ERR(data->vdd_reg);
1547 }
1548
1549 data->vddio_reg = devm_regulator_get(&client->dev, "vddio");
1550 if (IS_ERR(data->vddio_reg)) {
1551 if (PTR_ERR(data->vddio_reg) == -EPROBE_DEFER)
1552 return -EPROBE_DEFER;
1553
1554 dev_err(&client->dev, "failed to get VDDIO regulator!\n");
1555 return PTR_ERR(data->vddio_reg);
1556 }
1557
1558 ret = regulator_enable(data->vdd_reg);
1559 if (ret) {
1560 dev_err(&client->dev, "failed to enable VDD regulator!\n");
1561 return ret;
1562 }
1563
1564 ret = regulator_enable(data->vddio_reg);
1565 if (ret) {
1566 dev_err(&client->dev, "failed to enable VDDIO regulator!\n");
1567 goto disable_regulator_vdd;
1568 }
1569
1570 ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
1571 if (ret < 0)
1572 goto disable_regulators;
1573
1574 switch (ret) {
1575 case MMA8451_DEVICE_ID:
1576 case MMA8452_DEVICE_ID:
1577 case MMA8453_DEVICE_ID:
1578 case MMA8652_DEVICE_ID:
1579 case MMA8653_DEVICE_ID:
1580 case FXLS8471_DEVICE_ID:
1581 if (ret == data->chip_info->chip_id)
1582 break;
1583 /* else: fall through */
1584 default:
1585 ret = -ENODEV;
1586 goto disable_regulators;
1587 }
1588
1589 dev_info(&client->dev, "registering %s accelerometer; ID 0x%x\n",
1590 match->compatible, data->chip_info->chip_id);
1591
1592 i2c_set_clientdata(client, indio_dev);
1593 indio_dev->info = &mma8452_info;
1594 indio_dev->name = id->name;
1595 indio_dev->dev.parent = &client->dev;
1596 indio_dev->modes = INDIO_DIRECT_MODE;
1597 indio_dev->channels = data->chip_info->channels;
1598 indio_dev->num_channels = data->chip_info->num_channels;
1599 indio_dev->available_scan_masks = mma8452_scan_masks;
1600
1601 ret = mma8452_reset(client);
1602 if (ret < 0)
1603 goto disable_regulators;
1604
1605 data->data_cfg = MMA8452_DATA_CFG_FS_2G;
1606 ret = i2c_smbus_write_byte_data(client, MMA8452_DATA_CFG,
1607 data->data_cfg);
1608 if (ret < 0)
1609 goto disable_regulators;
1610
1611 /*
1612 * By default set transient threshold to max to avoid events if
1613 * enabling without configuring threshold.
1614 */
1615 ret = i2c_smbus_write_byte_data(client, MMA8452_TRANSIENT_THS,
1616 MMA8452_TRANSIENT_THS_MASK);
1617 if (ret < 0)
1618 goto disable_regulators;
1619
1620 if (client->irq) {
1621 int irq2;
1622
1623 irq2 = of_irq_get_byname(client->dev.of_node, "INT2");
1624
1625 if (irq2 == client->irq) {
1626 dev_dbg(&client->dev, "using interrupt line INT2\n");
1627 } else {
1628 ret = i2c_smbus_write_byte_data(client,
1629 MMA8452_CTRL_REG5,
1630 data->chip_info->all_events);
1631 if (ret < 0)
1632 goto disable_regulators;
1633
1634 dev_dbg(&client->dev, "using interrupt line INT1\n");
1635 }
1636
1637 ret = i2c_smbus_write_byte_data(client,
1638 MMA8452_CTRL_REG4,
1639 data->chip_info->enabled_events);
1640 if (ret < 0)
1641 goto disable_regulators;
1642
1643 ret = mma8452_trigger_setup(indio_dev);
1644 if (ret < 0)
1645 goto disable_regulators;
1646 }
1647
1648 data->ctrl_reg1 = MMA8452_CTRL_ACTIVE |
1649 (MMA8452_CTRL_DR_DEFAULT << MMA8452_CTRL_DR_SHIFT);
1650
1651 data->sleep_val = mma8452_calculate_sleep(data);
1652
1653 ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1,
1654 data->ctrl_reg1);
1655 if (ret < 0)
1656 goto trigger_cleanup;
1657
1658 ret = iio_triggered_buffer_setup(indio_dev, NULL,
1659 mma8452_trigger_handler, NULL);
1660 if (ret < 0)
1661 goto trigger_cleanup;
1662
1663 if (client->irq) {
1664 ret = devm_request_threaded_irq(&client->dev,
1665 client->irq,
1666 NULL, mma8452_interrupt,
1667 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
1668 client->name, indio_dev);
1669 if (ret)
1670 goto buffer_cleanup;
1671 }
1672
1673 ret = pm_runtime_set_active(&client->dev);
1674 if (ret < 0)
1675 goto buffer_cleanup;
1676
1677 pm_runtime_enable(&client->dev);
1678 pm_runtime_set_autosuspend_delay(&client->dev,
1679 MMA8452_AUTO_SUSPEND_DELAY_MS);
1680 pm_runtime_use_autosuspend(&client->dev);
1681
1682 ret = iio_device_register(indio_dev);
1683 if (ret < 0)
1684 goto buffer_cleanup;
1685
1686 ret = mma8452_set_freefall_mode(data, false);
1687 if (ret < 0)
1688 goto buffer_cleanup;
1689
1690 return 0;
1691
1692 buffer_cleanup:
1693 iio_triggered_buffer_cleanup(indio_dev);
1694
1695 trigger_cleanup:
1696 mma8452_trigger_cleanup(indio_dev);
1697
1698 disable_regulators:
1699 regulator_disable(data->vddio_reg);
1700
1701 disable_regulator_vdd:
1702 regulator_disable(data->vdd_reg);
1703
1704 return ret;
1705 }
1706
1707 static int mma8452_remove(struct i2c_client *client)
1708 {
1709 struct iio_dev *indio_dev = i2c_get_clientdata(client);
1710 struct mma8452_data *data = iio_priv(indio_dev);
1711
1712 iio_device_unregister(indio_dev);
1713
1714 pm_runtime_disable(&client->dev);
1715 pm_runtime_set_suspended(&client->dev);
1716 pm_runtime_put_noidle(&client->dev);
1717
1718 iio_triggered_buffer_cleanup(indio_dev);
1719 mma8452_trigger_cleanup(indio_dev);
1720 mma8452_standby(iio_priv(indio_dev));
1721
1722 regulator_disable(data->vddio_reg);
1723 regulator_disable(data->vdd_reg);
1724
1725 return 0;
1726 }
1727
1728 #ifdef CONFIG_PM
1729 static int mma8452_runtime_suspend(struct device *dev)
1730 {
1731 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1732 struct mma8452_data *data = iio_priv(indio_dev);
1733 int ret;
1734
1735 mutex_lock(&data->lock);
1736 ret = mma8452_standby(data);
1737 mutex_unlock(&data->lock);
1738 if (ret < 0) {
1739 dev_err(&data->client->dev, "powering off device failed\n");
1740 return -EAGAIN;
1741 }
1742
1743 ret = regulator_disable(data->vddio_reg);
1744 if (ret) {
1745 dev_err(dev, "failed to disable VDDIO regulator\n");
1746 return ret;
1747 }
1748
1749 ret = regulator_disable(data->vdd_reg);
1750 if (ret) {
1751 dev_err(dev, "failed to disable VDD regulator\n");
1752 return ret;
1753 }
1754
1755 return 0;
1756 }
1757
1758 static int mma8452_runtime_resume(struct device *dev)
1759 {
1760 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1761 struct mma8452_data *data = iio_priv(indio_dev);
1762 int ret, sleep_val;
1763
1764 ret = regulator_enable(data->vdd_reg);
1765 if (ret) {
1766 dev_err(dev, "failed to enable VDD regulator\n");
1767 return ret;
1768 }
1769
1770 ret = regulator_enable(data->vddio_reg);
1771 if (ret) {
1772 dev_err(dev, "failed to enable VDDIO regulator\n");
1773 regulator_disable(data->vdd_reg);
1774 return ret;
1775 }
1776
1777 ret = mma8452_active(data);
1778 if (ret < 0)
1779 goto runtime_resume_failed;
1780
1781 ret = mma8452_get_odr_index(data);
1782 sleep_val = 1000 / mma8452_samp_freq[ret][0];
1783 if (sleep_val < 20)
1784 usleep_range(sleep_val * 1000, 20000);
1785 else
1786 msleep_interruptible(sleep_val);
1787
1788 return 0;
1789
1790 runtime_resume_failed:
1791 regulator_disable(data->vddio_reg);
1792 regulator_disable(data->vdd_reg);
1793
1794 return ret;
1795 }
1796 #endif
1797
1798 static const struct dev_pm_ops mma8452_pm_ops = {
1799 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
1800 SET_RUNTIME_PM_OPS(mma8452_runtime_suspend,
1801 mma8452_runtime_resume, NULL)
1802 };
1803
1804 static const struct i2c_device_id mma8452_id[] = {
1805 { "mma8451", mma8451 },
1806 { "mma8452", mma8452 },
1807 { "mma8453", mma8453 },
1808 { "mma8652", mma8652 },
1809 { "mma8653", mma8653 },
1810 { "fxls8471", fxls8471 },
1811 { }
1812 };
1813 MODULE_DEVICE_TABLE(i2c, mma8452_id);
1814
1815 static struct i2c_driver mma8452_driver = {
1816 .driver = {
1817 .name = "mma8452",
1818 .of_match_table = of_match_ptr(mma8452_dt_ids),
1819 .pm = &mma8452_pm_ops,
1820 },
1821 .probe = mma8452_probe,
1822 .remove = mma8452_remove,
1823 .id_table = mma8452_id,
1824 };
1825 module_i2c_driver(mma8452_driver);
1826
1827 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
1828 MODULE_DESCRIPTION("Freescale / NXP MMA8452 accelerometer driver");
1829 MODULE_LICENSE("GPL");
Linux with added FPC-III support